77806823 has 4 divisors (see below), whose sum is σ = 79616328. Its totient is φ = 75997320.

The previous prime is 77806793. The next prime is 77806837. The reversal of 77806823 is 32860877.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77806823 - 2⁶ = 77806759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77806873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 904688 + ... + 904773.

It is an arithmetic number, because the mean of its divisors is an integer number (19904082).

Almost surely, 2^77806823 is an apocalyptic number.

77806823 is a deficient number, since it is larger than the sum of its proper divisors (1809505).

77806823 is a wasteful number, since it uses less digits than its factorization.

77806823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1809504.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 77806823 is about 8820.8175924911. The cubic root of 77806823 is about 426.9128503445.

The spelling of 77806823 in words is "seventy-seven million, eight hundred six thousand, eight hundred twenty-three".